For wheezy I'm planning to change the linking behaviour for DSOs
(turning on --as-needed and --no-copy-dt-needed-entries. The
rationale is summarized in
http://wiki.debian.org/ToolChain/DSOLinking. I would like to know
about issues with these changes on some of the Debian ports, and if
we need to disable one of these changes on some port.

--no-add-needed sounds like it'll cause a *lot* of build failures for no
particular gain. I don't think it's a good idea.

I think it is. Besides fixing potential bugs, else you'll never be able to use
gold as the linker. See the already filed bug reports.